Watch biker scrub handlebars in game of 'Motorcycle Limbo'

You needn't look further than Monster Energy Supercross or the Isle of Man TT to work that out.

However, the thing about these riders is that though at times we question their sanity, they are also extraordinarily talented.

Take, for example, Alan Birtwistle, who was partaking in an event called "Motorcycle Limbo" at Dirt Quake 4 in England earlier this year.

In this 38-second video, Birtwistle is seen taking four attempts at leaning his motorcycle over as much as possible to try and see just how low he could go, scrubbing his handlebars on the ground the third and fourth times.